/**
 * Copyright (C) 2024 AIDC-AI
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.langengine.core.model.fastchat.service;

import com.alibaba.langengine.core.model.fastchat.completion.chat.ChatCompletionRequest;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;

public class ChatCompletionRequestSerializerAndDeserializer {

    public static class Serializer extends JsonSerializer<ChatCompletionRequest.ChatCompletionRequestFunctionCall> {
        @Override
        public void serialize(ChatCompletionRequest.ChatCompletionRequestFunctionCall value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
            if (value == null || value.getName() == null) {
                gen.writeNull();
            } else if ("none".equals(value.getName()) || "auto".equals(value.getName())) {
                gen.writeString(value.getName());
            } else {
                gen.writeStartObject();
                gen.writeFieldName("name");
                gen.writeString(value.getName());
                gen.writeEndObject();
            }
        }
    }

    public static class Deserializer extends JsonDeserializer<ChatCompletionRequest.ChatCompletionRequestFunctionCall> {
        @Override
        public ChatCompletionRequest.ChatCompletionRequestFunctionCall deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
            if (p.getCurrentToken().isStructStart()) {
                p.nextToken(); //key
                p.nextToken(); //value
            }
            return new ChatCompletionRequest.ChatCompletionRequestFunctionCall(p.getValueAsString());
        }
    }
}
